My engine vibration is normal, what is causing my unwanted cabin vibration?
If the engine vibration is reasonable, then vibration readings are collected in the cabin so that the “felt” vibration can be evaluated. While the engine may be producing “normal” vibration levels, these normal vibrations may be transmitted abnormally to the airframe due to lack of isolation between the engine and firewall. A vibration check can point the way to detection of isolation problems such as bad engine isolators, hoses which do not have adequate service play, exhaust system to airframe contact, etc.
